| 摘要 |
PROBLEM TO BE SOLVED: To provide a weight assembly sub-assembled beforehand and facilitating the sub-assembling while suppressing cost increase. SOLUTION: This weight assembly 12 comprises a bolt formed with a shaft part 21 in the side of a head part 18 and formed with a rolling screw 22 in the tip side of the shaft part 21, and a weight 10 formed with a female screw 16 threaded around the rolling screw 22. This assembly is so sub-assembled that the inside diameter D11 of the female screw 16 is formed larger than the outside diameter D12 of the shaft part 21, so that the weight 10 is threaded around a bolt 11 and moved till the shaft part 21 and at the same time the weight 10 is prevented from being pulled out from the shaft part 21 of the bolt 11. If the weight is threaded around the bolt and moved to the shaft part, the weight is stopped at the rolling screw of the bolt and prevented from being pulled out. This constitution can easily sub-assemble it compared with a conventional case where the weight is press-fitted in a knurling tool part provided in the bolt. The cost increase can be also suppressed by using an existing bolt and machining the weight in such a manner that the inside diameter becomes larger relative to the existing female screw shape. COPYRIGHT: (C)2004,JPO
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